The WMA-3000 driveway alarm from Dakota Alert Inc. operates on one 9-volt battery and can be mounted on a tree or post near the driveway. The transmitter will detect people or vehicles out to about 80 ft., then send a radio signal back to the WR-3000 receiver up to 3,000 ft. away depending on local terrain. The transmitter is weatherproof and meant for exterior locations. Up to four zones can be monitored with additional transmitters. The transmitters can be programmed so they will each sound a different tone at the receiver. 

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